package main

import "fmt"

func main() {
	m := map[string] string {
		"name": "xiaoming",
		"course": "golang",
		"age": "18",
	}
	m1 := make(map[string]int) // m1 == empty map 空map
	var m2 map[string] int  // m2 == nil 空
	
	for k, v := range m {
		fmt.Println(k, v)
	}
	
	fmt.Println(m)
	fmt.Println(m1)
	fmt.Println(m2)
}